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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c46bc007657bad97a5ee9934298dfb9ecc4d8217268a0a7b736d7d7987e17f67' 
  AND token = '6MTved75XyJp0Byl0sVU0Gb8CQe2fhj+vVGhGHtw7tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}